Metal pump for typographical machines



P 1934. R. H. TURNER 1,972,837

METAL PUMP FOR TYPOGRAPHICAL MACHINES Fil'ed June 14, 1953 2Sheets-Sheet l INVENTOR Raqson; H 7222 729! ATTORN EY Sept. 4, 1934. R.H. TURNER 1,972,337

METAL PUMP FOR TYPOGRAPHICAL MACHINES Filed June 14, 1953 2 Sheets-Sheetv2 AT'i'ORNEY Patented Sept. 4, I934 METAL PUMP FOR TYPOGRAPHICALMACHINES,

Ransom Turner, Little Neck, Long Island,

N. Y., assignor to Intertype, Corporation,

Brooklyn, N. Y., a corporationof New York Application June 14, 1933,Serial No. 675,848

In Germany June 15, 1932 16 Claims (01. 2.2-7oj The present inventionrelates to improvements in the metal injecting pump for the metal potof'a line casting machine, and more particularly to that of thewell-known class substantially shown and described in U. S. LettersPatents Nos. 436,531 and 436,532, granted September 16, 1890,

wherein the pump, actuated by 'a spring andunder the control of a rotarycam, forces a charge of molten metal out of the metal pot into a mold 10to cast a type bar or slug against a composed line of character bearingmatrices, the cam making one complete revolution for each cycle of,operation of the machine and having its active surface concentricthroughout, except for a recess or depression at one point in itscircumference to permit the pump plunger to descend under the action ofits spring at the proper time for making the cast. The pump plunger isnormally held by the cam in raised or inactive position against thetension of its spring bya pump lever pivoted on the machine frame andcarrying a roller on one of its arms which bears against the cam, theother arm of said lever being connected directly to the pump plungerrod, and since the Z5 roller, under the tension of the pump actuatingspring, rides on the surface of the cam for the greater part of eachrevolution thereof or during the time the pump is inactive, the surfaceof the cam in pumps as heretofore generally used, is

subjected to considerable wear.

It is desirable, especially for casting large slugs, that the pressureof the pump spring be as great as possible in order that the metal willbe injected with suflicient force into the mold, but under suchincreased pressure the wear of the cam would become excessive unlesssome means were provided to compensate therefor. Moreover, whilereturning the pump plunger to inactive or retracted position after .ametal injecting or casting stroke, considerable resistance is oifered tothe rotation of the cam while stretching or resetting the pump springthrough contact of the pump roller with vthe rapidly rising surface ofthe cam at the end of the recess or depression therein following thepump release a,

the pump controlling cam, both while sustaining the pump plunger meansin inactive position'and while lifting or retracting the pump plungermeans after the metal injecting .or casting stroke thereof. Toaccomplish these results, the present invention provides a plurality ofrollers for sustaining the pump plunger means in inactive or retractedposition, these rollers being so arranged that during the lifting orretracting of the pump plunger means, the rollers will successively comeinto action and each of the rollers will sustain a portion of the loadimposed while in the act of stretching the pump spring or springs. Thepresent invention also proposes arranging these rollers so that as theload imposed by stretching the pump spring or springs increases, therewill be a compensatingincrease in the lever arm through which thesuccessive rollers operate in contacting with the rotating, cam. Thepresent invention further provides an arrangement whereby the springpressure for injecting the metal into the mold can be appreciablyincreased to any extent desirable for producing slugs of large size and,notwithstanding the. supporting of the load resulting from suchincreased spring pressure on a. plurality of rollers, all of the rollerswill be released simultaneously and thereby render the entire springpressure acting on the metal pump .eifective for the metal injectingoperation.

According to the present invention, the machine may be provided with apump having one or several pump plungers, working in the usual metalpot, it being preferable if several pump. plungers are used, that eachbe provided with its own pumpspring. The invention however enables butone pump cam to be used, as is usual with machines of thisgclass, therollers being arranged to run one behind the other on the same 1 cam.

To these and other .ends, the invention consists in certain improvementsand combinations and arrangements of parts all as will :be hereinafterdescribed, the features of novelty being pointed. out particularly inthe claims at the end of this specification.

In the accompanying drawings:

Figure 1 is a side elevation of the casting mechanism of a line castingmachine embodying the present invention;

' ent invention, the parts beingwshown in the position they occupyimmediately before casting .operation., I a

Figure 4 is a side elevation of a part of the mechanism shown in Figure3 but showing the parts in the position they occupy when the pumpplunger is about to be lifted or retracted; and

Figure 5 is a top plan of part of the structure shown in Figure 3.

Similar parts are designated by the same reference characters in thedifferent figures.

Referring first to Figures 1 and 2 which show the invention applied tocasting mechanism wherein the metal pot is provided with a plurality ofpump plungers and a corresponding plurality of pump levers and springs,each lever having its roller working against the control cam, lrepresents the metal pot which may be substantially similar inconstruction to that usedgenerally in line casting machines of the classreferred to, it containing a pump comprising a pluralityof cylinders 2and a corresponding plurality of plungers 3 reciprocable verticallytherein, the pump cylinders communicating with a throat 4 leading to amouth piece 5 adapted to be brought against the mold in which the typebar or slug is to be cast in the usual manner and through which themolten metal is injected into the mold by descent of the pump plungers3. 'In the present case, three pump plungers are shown, and acorresponding set of three pumplevers 6, land 8 are provided, these pumplevers being pivoted to rock on a common shaft or pivot 9 supported by abracket 10 mounted in fixed position on the frame of the machine and onearm of each of these levers is pivotally connected to the actuating rod11, 12 or 13 of the respective pump plunger, and such arm of each'of thepump levers is acted on by a tension spring 14 through a rod 15 so thatthese springs act to swing the respectivepump leverstion of molten metalfrom the metal pot into the mold. The other arms of the pump leverscarry rollersfi '7 and 8 respectively, which are arranged to run, onebehind the other on the cam 16 whch may be mounted on the main cam shaft1'7 as usual iii-machines of this class, the periphery oractive surfaceof this cam being concentric throughout its extent except for a recessor depression 18 therein, this recess providing at its forward end adrop-off point 19 for the rollers to 'permit the metal injecting orcasting operation of the pump, and providing toward its rear end aninclined surface 20 leading to the concentric periphery of the cam andwith which the rollers cooperate to lift or retract the pump plungers.It

will-be understood that the cam makes one complete revolution in thedirection of the arrow in shaped that these rollers are at increasingdiswhich project laterally from its opposite sides and are'arranged toengage the under sides of shoulders 6 and 8 respectively, of the pumplevers 6 and 8. As the cam rotates in the direction'of the arrow, thepump plungers connected to the --levers 6 and 8 will beheld inactive bythe engagement of the stop lugs '7 beneath the shoulders 6 and 8respectively, after the release point 19 onthe cam passes from beneaththeir respective rollers 6 and 8 and until the release point 19 passesfrom beneath the roller '7 of the pump lever '7, whereupon all of thepump plungers will be released simultaneously for the metal injectingoperation.

When the cam rotates sufficiently far to bring the inclined surface 20thereon'into contact with the roller 8 the pump lever 8 'on which thisroller is carried will be rocked about the pivot or fulcrum point 9 tolift its respective plunger, immediately succeeding which the inclinedsurface 20 of the cam. will contact with the roller 6 on the pump" leverB and will rock the latter about the pivot 9 to lift the plungerconnected to this lever, and upon further rotation of the cam, the

inclined surface 20 thereon will contact with the roller '7 on the pumplever '7 and will rock the latter in a direction to lift or retract thepump plunger connected thereto. The arrangement of the rollers is suchthat by the time the inclined surface 20 on the cam contacts with theroller 6 the plunger connected to the pump lever.8 will be almostcompletelylifted and the'pump spring for the lever 8 will becorrespondingly" stretched nearly to its full tension so that theresistance offered'to'the rotation of the cami will be only thatproduced bya single pump spring. Similarly, by the time the inclinedsurface 20 on the cam contacts with the roller 7 on the pump lever '7,the pump plunger attached to the pump lever 6 will be almost completelyilifted and its spring will have been brought substantially to fulltension. Thus, each of the pump plunger's will be lifted orretracted bysucoessive contact of their respective rollers with the inclined'portion20 on the cam in such a man 1- nor that the power of only one pumpspring at a time must be overcome.

In addition to the successive contacting of the cam with therespectivepump'rollers to lift the respective pump plungers and reset theirtension g;

springs, it is to be noted that each successive "roller will swing in anare which is located further from the com'mon'fulcrum point 9 in thedirection of the circumference of the cam so that the successive rollerswill act through. lever arms of increasing lengths, resulting in areduction of the load exerted by each roller on the cam, and while thereare a plurality of rollers operating against the inclined rise in thecam as the latter rotates, the wear on the cam will not be increased iinproportion to the number of rollers.

In the embodiment of the inventionshown in Figures 3, 4 and 5, only'onepump plunger 3 is employed for the metal pump 2 in the metal pot 1 thissingle plunger operating by its descent to inject metal from the metalpot into'the mold in the usual manner, the operating rod 21 for the.plunger being connected to one arm of a single pump lever 22 which ispivoted to rock on the pivot pin or fulcrum 9, the controlling cam 16 1having the drop off point 19 leading to the recess or depression 18 andthe inclined rise 29 leading from said recess, being like that describedin' connection with Figures 1 and 2, the pump lever being depressed toactua'tethe pump plunger on its metal injecting stroke by a tensionspring 14" acting on a rod 15 which bears on the pump lever. In thisembodiment of the invention, a plurality of rollers are provided fordistributing the load of thepump spring against the cam, two of such 115 rollers 23 and 24 being'shown which are rotatably,-

mounted on a bracket orv carriage 25, this car riage being pivoted onthe pump lever 22 by the the pump lever swings, this carriage 25in'eifect forming the roller carrying arm of the pump lever. The pumplever isprovided with stop lugs- 27 which project. laterally therefrom,and the.

carriage is provided with stop lugs 28 to engage the stop lugs 27 andthereby limit the swing of the carriage in one direction about its pivot26.

While the rollers 23 and 24 are in engagement.

neath the last roller 24, this roller beingshown about to be released inFigure 3. After the metal injecting stroke of the plunger has takenplace, following the passing of the release point 19 on the cam beyondthe rollers, the continued rotation of the cam brings the inclined rise20 thereon into contact with the first roller 23 and therer by tips thecarriage about its pivot 26 intovthe position shown in Figure 4,immediately following which both rollers 23 and 24 will bear againstvthe inclined rise 20 on the cam during the early stages of lifting orretracting the pump plunger. As soon as the further rotation of the cambrings the first roller 23 onto the concentric portion of the cam, thecontinued rotation of the cam will cause the carriage 25 to rock aboutits pivot 26 on the pump lever so that the center of rotation of thesecond roller 24 will be carried to a point further away from thefulcrum point 9. of the pump lever. Such forced rotation of the carriageI125 will thereby increase the length of the lever arm between thefulcrum 9 and the second roller 24, so thatthe resistance againstrotation of the.

cam during the last stage of stretching the pump spring will becorrespondingly reduced. v

; The invention as applied in either of theembodiments hereinbeforedescribed, has the advantage of distributing the load on the cam while.the pump is being retracted in such a way that I wear or disturbing theoperating efliciency of the machine.

I claim as my invention: 1. A casting pump for typographical machineshaving at least one metal injecting plunger, and

a cam for controlling the operation of the pump, pump actuating meansconnected to the pump and carrying a plurality of rollers runningsimultaneously on the cam, and stops operative to hold said actuatingmeans in retracted position and to effect full release of the totalavailable actuating force of said actuating means and thereby start thepumping operation of the pump when the rearmost roller is released bythe cam.

2. A casting pump according to claim 1 wherein said rollers distributetodifierent portions of said cam the resistance encountered thereby inretractingsaid pump actuatingmeans.

- 'EV-Acasting-pump according to claim 1. wherein :the pump comprises aplurality of pumpplungers, said pump actuating means comprises apluralityof differentpump levers on which said rollers are carried, andsaid rollers run one behind the other on thesame cam, and said stops areoperative to effect fullrelease of said plurality of pump. levers andthereby start the pumping strokes of said plungerswhen the rearmostroller is released by the-cam;

4. A casting pump according to claim 1 wherein the. pump is providedwith a single pump plunger, said pump actuating means comprises a springactuated pumplever having a carriage pivoted thereto for carrying saidrollers, and astop is provided on the pump-lever to hold said carriagein a position which-causes the cam to operate on a lever arm; ofincreased length during the latter stages of 'tensioning of the pumplever actuating spring.

'5. In a typographical machine having a metal pot provided with a metalinjecting pump, and a rotary cam having a depression therein forcontrolling the operation of the pump, spring operated actuating meansconnected to the pump and carrying a plurality of rollers simultaneouslyengaging thecam, one behind the other, and

means for preventing operation of the pump actuating means and 'foreffecting full release eration of the pump when the rearmost of saidrollers reaches the depression in the cam.

6. In a typographicalmachine having a metal pot provided with a metalinjecting pump, and a rotary cam for controlling the operation of thepump, pivoted'spring operated actuating means connected to the pum -ancarrying a plurality of rollers located thereon at different distancesfrom the pivotal center of 'saidactuating means and engageable' withthecam successively in the order of their distances "from said pivotalcenter, the roller nearest said pivotal center engaging the cam first.

7. In atypographical: machine having a metal pot'provi'ded with a metalinjectingpump and a rotary cam having a depression therein: forcontrolling the operation of the pump, pivoted spring operated actuatingmeans for'the pump carrying a plurality of rollers located atdifigerentdistances from the pivotal center of the actuating means and engageableand disengageable with respect to the cam successively in the order oftheir distances from said pivotal center, and means for holding saidactuating means from operation until the roller most distant from itspivotal center is released by the depression in the cam.

8. In a typographical machine having a metal pot provided with a metalinjecting pump embodying a plurality of plungers, and a rotary cam forcontrolling the operation of said plungers, actuating means for the pumpcomprising a plurality of pump levers having a common pivot,'one

lever being connected to each pump plunger and each lever carrying aroller, and a spring for actuating each pump lever, the rollers of saidpump levers being engageable with the cam at different distances fromthe pivotal center of the pump levers, and the lever carrying the rollermost distant from said pivotal center having means for holding the otherpump levers against tau! actuation until the cam releases said mostdis-' tant roller. i

9. In a typographical machine having a metal pot provided with a metalinjecting pump embodying a plurality of plungers and a rotary cam forcontrolling the operation of said plungers, actuating means for the pumpcomprising a plurality of pump levershaving a common pivot, one leverbeing connected to each pump plunger and each lever carrying a roller,and a spring for actuatingeach pump lever, the rollers of said pumplevcrsbeing engageable with the cam at difierent distances from thepivotal center of the pump levers, and the lever carrying the rollermost distant fromsaid pivotal center having stop lugs thereon to engage,other of said pump levers and thereby hold them against actuation untilthe cam releases said most distant roller.

10. In a typographical machine having a metal pot with a metal injectingpump therein, and a rotary cam for controlling the operation of saidsump, a pump lever carrying thereon a plurality of rollerssimultaneously engaging said cam, and means for preventing the operationof the pump until the cam disengages the last one of said rollers.

11..In a typographical machine, the combination of a metal pot, a pumpplunger therein, a spring actuated operating lever therefor, a rotarycam for controlling said lever, and a plurality of rollers carried onsaid lever and engageable with said cam, said rollers engaging said camsimultaneously at different points during the rotation of said cam tocorrespondingly distribute the load of the pump spring thereon.

12. In a typographical machine having a metal pot and a metal injectingpump, a rotary cam for controlling said pump, and a pivoted pump levercarrying a plurality of rollers thereon at increasing distances, in thedirection of rotation of said earn, from the pivotal point of saidlever, said rollers being engageable with the pump retracting portion ofsaid cam successively in the order of their increased distances from thepivotal point or" said lever, the roller nearer said pivotal centerengaging the cam first.

13. In a typographical machine having a metal pot provided with a metalinjecting pump embodying a plunger, and a rotary cam for controlling theoperation of said pump plunger, actuating means for the pump comprisinga pivoted pump lever connected to said plunger, a spring for actuatingsaid lever, and a member pivoted on said pump lever and carryingaplurality of rollers located at diiferent distances from the pivotalcenter of the pump lever and engageable successively by the cam, saidmember being swingable about its pivot on the pump lever under theaction of the cam on said rollers in retracting the pump plunger toincrease the distances of said rollers from the pivotal center of thepump lever.

14. In a typographical machine having a metal pot provided with a metalinjecting pump embodying a plunger, and a rotary cam having a depressiontherein for releasing the pump, actuating means for the pump comprisinga pivoted pump lever connected to said plunger, a spring for actuatingsaid lever, a memberpivoted on said pump lever to swing relativelythereto and carrying a plurality of rollers located at differentdistances from the pivotal center of the pump lever and engaging saidcam one behind the other, and stop means for limiting the swing of saidmember in one direction relatively to said pump lever to hold the latterin retracted position until the roller most distant from the pivotalcenter of the pump lever is released by the depression in the cam, saidrollers being engageable successively with the cam beyond saiddepression and operative to swing said member in a direction to increasethe distance of the rollers thereon from the pivotal center of the pumplever while the cam is acting on said rollers to retract the pump 105lever.

15. The combination, with casting mechanism for typographical machineshaving metal injecting means and retractable actuating means therefor,of control means for said actuating means comprising a single rotatablecam, a plurality of cooperating rollers operatively associated with saidactuating means, and means for distributing the load of retracting saidactuating means to different portions of said cam.

16. Casting mechanism for typographical machines, which comprises metalinjecting means, releasable and retractable actuating means therefor,control means for said actuating means including a single rotatable camand a plurality of 120 cooperating rollers each operative to assist inretracting said actuating means, and means forcausing the full releaseof said actuating means at a predetermined point in the rotation of saidcam. 1

I RANSOM H. TURNER.

